EFRT M-12 Issue Resolution: Comparison of Filter Performance at PEP and CUF Scale

Functions and Requirements of the Radioactive Waste Test Platform

“…However, shorter, single tubes are used in bench-scale processes. Previous work with simulants in the Pretreatment Engineering Platform has demonstrated that the performance for full-length bundles is approximately the same as for single 2-foot filter elements when represented as a filter flux (permeate rate/surface area) (Daniel et al 2010).…”

“…As indicated in Table 2, the 6-inch-long filter element more closely matches the full-scale filter feed tank-volume-to-filter-area ratio (66 vs. 50 cm 3 /cm 2 ), and given the low amount of solids expected in the AP-105 feed (first feed slated to be tested), the 6-inch filter is recommended. However, it is worth noting that the 2-foot-long filter elements have been demonstrated to provide sufficient length to generally avoid measurable entrance effects (Daniel et al 2010). This demonstration has not been performed for the 6-inch filter.…”

Long-time performance of a stainless steel crossflow filter with simulated Hanford tank waste

“…A similar simulant has been used in prior filtration testing (over a shorter duration) at the bench and pilot scale Daniel et al, 2009Daniel et al, , 2010. For more detailed information on the simulant composition and makeup refer to Scheele et al (2009), where the material used in these tests was from Batch 2 (see Tables 3.10, 3.12, and 3.13).…”

“…Crossflow filtration of HLW simulants has, thus far, not exhibited a steady-state behavior (on the 12 h time scale) and showed decline in performance, e.g. measured permeate flux, after days of operation in a pilot scale facility (Daniel et al, 2010).…”

“…To this end, a series of bench-scale filtration tests were performed using a stainless steel microfilter and a waste simulant used in previous testing Daniel et al, 2010), with transmembrane pressure (TMP) and axial velocity as testing variables. The test duration was chosen to be long enough to observe long-term filtration performance trends, e.g.…”